package com.example.forum.interceptor;

import com.example.forum.common.AppConfig;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;


//预处理 true表示继续流程 false表示中断
@Component
public class LoginInterceptor implements HandlerInterceptor {
    @Value("${forum.login.url}")
    private String defaultURL;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        HttpSession session = request.getSession(false);
        if(session!=null&&session.getAttribute(AppConfig.USER_SESSION)!=null){
            //表示正常登录
            return true;
        }
        //代表没有正常登录
        if(!defaultURL.startsWith("/")){
            defaultURL="/"+defaultURL;
        }
        response.sendRedirect(defaultURL);
        return false;
    }
}
